Pro Tennis Championships was a men's tennis tournament played on outdoor hard courts at the Longwood Cricket Club in Boston, USA and was part of the 1971 World Championship Tennis circuit.

Tony Roche was the defending champion but did not participate in this edition.

Sixth-seeded Ken Rosewall won the singles title, his third U.S.

Pro title, and the accompanying $10,000 first-prize money.

[2][3] Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.